Appliance for handling layers of palletized products

1. An apparatus for handling layers of palletized products, comprising:

a gripping head associable to a transfer machine adapted to displace said gripping head at least along a substantially vertical direction, said gripping head being provided with at least one support framework associable to said transfer machine and at least one substantially horizontal suction plane associated to said support framework and adapted to suction a layer (S) of palletized products (P),

wherein said gripping head comprises at least one fall-prevention plane associated to said support framework and mobile between a rest configuration, wherein the space underlying the suction plane is clear and the suction plane is free to be arranged at contact with the upper surface of the layer (S) of products (P), and an operating configuration, wherein the fall-prevention plane is arranged below the suction plane and the layer (S) of suctioned products (P), to prevent the products (P) from falling during the displacement of the gripping head by the transfer machine,

wherein said gripping head comprises one flexible curtain element along each side of said suction plane and a plurality of substantially horizontal bars adapted to push each of said flexible curtain elements inwards for at least partial adhesion thereof to the lateral walls of said layer (S) of products (P), wherein each horizontal bar is moved towards or away from said flexible curtain element through a system of rocker levers actuated by automatic actuators,

wherein each flexible curtain element hangs freely from a respective side of said suction plane in such a manner that each flexible curtain element is separated from said plurality of substantially horizontal bars and is adapted to be able to be shortened or extended depending on the height of the products (P) and the distance between the products (P) and said flexible curtain elements,

wherein each flexible curtain element is oriented between the lateral wall of the layer (S) of products (P) and said plurality of substantially horizontal bars,

wherein each horizontal bar is affixed to a distal end of each of said rocker levers, and

wherein, when said gripping head is being displaced by the transfer machine to move a layer (S) of products (P), and when said suction plane is suctioning said layer (S) of product (P), each horizontal bar is moved towards said flexible curtain element by its associated rocker lever and pushes on each flexible curtain element on each side of said suction plane to cause said at least partial adhesion of each flexible curtain element to each lateral wall of said layer (S) of product (P) so as to guarantee the suction vacuum for gripping the layer (S).

2. The apparatus according to claim 1 , wherein said fall-prevention plane is associated to a guide structure mounted on said support framework and adapted to guide said fall-prevention plane between a substantially vertical lateral position in said rest configuration and a horizontal position in said operative configuration.

3. The apparatus according to claim 2 , wherein said guide structure comprises at least one pair of horizontal tracks arranged at the base of said gripping head, and at least one pair of substantially vertical lateral tracks, associated to said horizontal tracks and arranged on a side of said gripping head.

4. The apparatus according to claim 2 , wherein said fall-prevention plane comprises a plurality of rollers whose ends are associated to two flexible members sliding along said guide structure.

5. The apparatus according to claim 4 , wherein said rollers are rotatably associated to said flexible members around the axis thereof.

6. The apparatus according to claim 2 , wherein said gripping head comprises at least one system for actuating the sliding of said fall-prevention plane along said guide structure.

7. The apparatus according to claim 6 , wherein said actuation system comprises at least one gear meshing with at least one of said flexible members and actuation means for the rotation of said gear.

8. The apparatus according to claim 2 , wherein said guide structure comprises two of said pairs of lateral tracks arranged on opposite sides of said gripping head.

9. The apparatus according to claim 1 , wherein said gripping head comprises two of said fall-prevention planes arranged opposite to each other.

10. The apparatus according to claim 1 , wherein said gripping head comprises sensor means adapted to detect the presence of possible obstacles along the path of said fall-prevention plane and to allow the passage from said rest configuration to said operative configuration only if said path is clear.

11. The apparatus according to claim 10 , wherein said sensor means comprise a series of sensors associated to said guide structure substantially at the height of said horizontal tracks.

12. The apparatus according to claim 1 , wherein said flexible curtain element can be adjusted to adapt to the dimensions of said layers (S).

13. The apparatus according to claim 1 , further comprising at least one suctioning source mounted on the ground and associated to said suction plane for interposing a flexible tubular conduit.

14. The apparatus according to claim 1 , wherein said support framework comprises engagement means for coupling to said transfer machine, said transfer machine being an anthropomorphic robot adapted to cooperate with at least one of a line for advancing pallets (B) bearing said products (P) and a line for separating said products (P).

15. An apparatus for handling layers of palletized products, comprising:

a gripping head associable to a transfer machine adapted to displace said gripping head at least along a substantially vertical direction, said gripping head being provided with at least one support framework associable to said transfer machine and at least one substantially horizontal suction plane having four sides and associated to said support framework and adapted to suction a layer (S) of palletized products (P),

wherein said gripping head comprises at least one fall-prevention plane associated to said support framework and mobile between a rest configuration, wherein the space underlying the suction plane is clear and the suction plane is free to be arranged at contact with the upper surface of the layer (S) of products (P), and an operating configuration, wherein the fall-prevention plane is arranged below the suction plane and the layer (S) of suctioned products (P), to prevent the products (P) from falling during the displacement of the gripping head by the transfer machine,

wherein said gripping head comprises a single flexible curtain element distributed along each of the four sides of said suction plane, and a plurality of substantially horizontal bars adapted to push each flexible curtain element inwards for at least partial adhesion thereof to the lateral walls of said layer (S) of products (P), wherein each horizontal bar is moved towards or away from said flexible curtain element through a system of rocker levers actuated by automatic actuators,

wherein each flexible curtain element hangs freely from a respective side of said suction plane in such a manner that each flexible curtain element is separated from said plurality of substantially horizontal bars and is adapted to be able to be shortened or extended depending on the height of the products (P) and the distance between the products (P) and said flexible curtain elements,

wherein each flexible curtain element is oriented between the lateral wall of the layer (S) of products (P) and said plurality of substantially horizontal bars,

wherein each horizontal bar is affixed to a distal end of each of said rocker levers, and

wherein, when said gripping head is being displaced by the transfer machine to move a layer (S) of products (P), and when said suction plane is suctioning said layer (S) of product (P), each horizontal bar is moved towards said flexible curtain element by its associated rocker lever and pushes on each flexible curtain element on each side of said suction lane to cause said at least partial adhesion of each flexible curtain element to each lateral wall of said layer (S) of product (P) so as to guarantee the suction vacuum for gripping the layer (S).